Multiple Choice
Which element is often involved in electron transport in biological systems?
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8. Respiration
Electron Transport Chain
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Where would you expect to find electron transport chains in a prokaryotic cell?
A
In the cytoplasm
B
In the nucleus
C
In the mitochondrial inner membrane
D
In the plasma (cell) membrane
Verified step by step guidance1
Understand the structure of prokaryotic cells: Prokaryotic cells lack membrane-bound organelles such as mitochondria and nuclei. Their cellular processes occur in the cytoplasm or are associated with the plasma membrane.
Learn the function of electron transport chains: Electron transport chains are involved in cellular respiration, where they facilitate the transfer of electrons to generate a proton gradient used for ATP synthesis.
Compare prokaryotic and eukaryotic cells: In eukaryotic cells, electron transport chains are located in the mitochondrial inner membrane. Since prokaryotic cells do not have mitochondria, their electron transport chains must be located elsewhere.
Identify the location in prokaryotic cells: In prokaryotic cells, the plasma membrane serves as the site for electron transport chains because it is the only membrane available for such processes.
Conclude that the correct answer is the plasma (cell) membrane, as it is the functional equivalent of the mitochondrial inner membrane in prokaryotic cells.
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